Type-writing machine.



PATENTED SEPT. 25, 19064 P. A. COOK. TYPE WRITING MACHINE.

APPLICATION FILED NOV. '25, 1905.

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,Witnesses PATENTBD SEPT. 25, 1906.

F. A. COOK. TYPE WRITING MACHINE.)

APPLICATION FILED NOV. 25, 1905.

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IO and reversing preferably, a horizontal further revolution 4o ratchetwith cooperating parts, the letter details of t FRANK A. COOK, OFHARTFORD, CONNECTICUT,

TYPEWRITER COMPANY, OF NEW YORK,

NEW JERSEY.

ASSIGNOR To UNDERWOOD N. Y., A CORPORATION OF TYPE-WRll'lNG MACHINE.

Specizfication of Letters Patent.

Patented Sept. 25, 1906'.

Application filed November 26, 1905. Serial No. 289,058-

To all whom it may concern: Be it known that I, FRANK A. Ooox, a citizenof the United States, residing in Hartford, in the county of Hartfordand State of Qonnecticut, have invented certain new and usefulImprovements in Type-Writing Machines, of which the following is aspecification.

This invention relates. to ribbon winding mechanisms of type-writing andother machines.

The object of the invention is to produce a simple and reliablemechanism for reversing the travel'of the ribbonwhich can be called intooperation at the completion of the unwinding of the ribbon from eitherspool without liability of straining the ribbon and which will act withpromptness.

In carrying out m invention I employ,

driving-shaft movable endwise to connect with either one of a pair ofspool-shafts. Upon said shaft I mount oosely two ratchet-wheels, whichare idle during the travel ofthe ribbon; but When either spool becomesdepleted a pawl is caused to engage its associated ratchet-wheel toarrest the same. Upon said ratchet-wheel is provided a cam, and upon thedriving-shaft is provided a coacting cam, whereby during of the shaftthe latter is cammed endwise to connect with the empty s 001. A similaroperation is performed at the other spool when the latter becomes empty.

The invention also includes improved means for ion arting intermittentrotation to the driving-s aft.

In the accompanying drawings, Figure 1 is a sectional elevationillustrating areversing shown in full lines in wor g positions. Fig. 2is a plan illustrating the reversingmechanism associated with one of thespools, the parts being shown in full lines at the moment when thereversing operation has been completed. Fig. 3 is a ers ective view ofthe mechanism, the leftan s 001 shown full of ribbon and the right-handreversing-mechanism bein about to operate. Fig. 4 shows lie parts whichwind the ribbondriving shaft. Fig. 5 is a sectional front elevation ofsaid winding parts. Fig. 6 shows details of the reversing members.

In the well-known .Underwood type} writing machine in connection withwhich my invention is illustrated types 1' strike rearwardly against thefront side of a platen 2. A ribbon 3 is threaded through avibrator 4and'wound upon spools 5 6. Th are carried by vertical shafts 7 8, upontheir lower ends bevel-pinions mesh with bevelpinions 11 12, fixed upona horizontal driving-shaft 13, which is rotated intermittently by meansof a crank 14, 'a link 15, and rock-shaft 16, the latter being rocked ateach type-stroke and the crank 14having a clutch connection to the shaft13.

At Fig. 3 the pinions 9 11 are seen in mesh, so that the ribbon iswinding on the full spool 5, the other spool 6 being empty. Anobstruction 17 at the end of the ribbon engages a finger 18, whichextends up from an arm 19, the latter fixed upon a vertical rock-shaft20, so that the obstruction '17 will cause the shaft 20 to turn. Uponthelower end of the latter is provided an arm 21, which at such turningmovement releases 'a pawl 22 and permits it to drop into engagement witha ratchet-wheel 23, which'is loose pawl is pivoted at it may preventrotation The arm 21 normally formed upon the pawl, use; but when saidarm is rocked by the ribbon it releases the pawl, and a weight 26,

e spools having 9 10 to 24 upon a fixture, so that of the ratchet-wheel.

formed upon the pawl, causes the latter to drop into the ratchet. To theside or face of the ratchet is fixed a cone 27, which projects into thepath of similar cones 28, which roject from the side ing fixed to theshaft 13, so as .to rotate therewith. The cone 27 beingstationary, the

nearest cone 28 rides thereon during the further rotation of the shaft13 and cams the latter endwise or toward the right at Fig.3 until thepinion 12 is brought into mesh with the pinion l0 and the ribbon beginsto wind upon the empty spool 6. A spring 30 returns the rock shaft 20 tonormal osition and causes the arm 21 to lift the paw 22 from the engagesa finger 25, so as to hold it out of of a disk 29, the latter be-' iupon the shaft 13. The

ratchet 23. The last part of the endwise movement of the shaft 13 iseffected by a spring 31, Fig.2, which is connected-to a plunger 32,sliding in a box 33 andhaving a cone-head 34 to fit in either of apair-of V- grooves '35 36, formed in a collar which is mounted upon theshaft 13. After the point of the detent 34. rides over the ridge 37 between said V-grooves the spring 31 has sulli cient force to cam theshaft endwise by the engagement of the detent 34 with the inclined wallof the adjoining groove. During such endwise movement of the shaftanother set of cams 38 upon another disk 39 is moved into position toengage a cam 40, provided upon the other ratchet 41 but said ratchet mayrevolve idly, since its pawl 42 is held up by an arm 43, correspondingto arm 21 and fixed upon a shaft 44, having a ribbon-engaging finger 45,corresponding to finger 18. Movement of the ratchets in axial directionis prevented by fixed projections 46, inserted between theratchet-wheels, and collars 47, secured upon hubs -18 of theratchet-wheels.

The crank 14 is provided with a recess 49., Fig. 4, in which is placed aball 50, which runs upon a bushing 51, which turns with the shaft 13.Said bushing turns in a bearing formed in a fixed bracket 52'and hasfixed upon its outer end a collar 53, from which projects a stud 54,loosely engaged by a crank 55, fixednpon the end of the shaft 13. Theshaft and bushing 51 are hence caused to turn together, while the shaftmay move endwise independently of the bushing, the stud 54 being longenough to permit such play. -A handle 56 may be formed upon the end ofthe stud 54 for winding the ribbon, and the other end of the shaft maybe also provided with a crank 57. The ball works .between the peripheryof the bushing 51 and aninclined wall of the recess 49, so as to gripsaid bushing when the crank 14 turns in one direction, but to run idlywhen the crank runs in the other direction, so that the shaft 13 is ro-.

t-ated.step by step at the operation of the types. It will be seen thatthe bushing 51 is provided. with a head 58 to confine the crank 14 andthat a fixed disk 59 is interposed between the collar 53 and the bracket52, whereby end'wise movement of the bushing and other parts isprevented. The fixed disk 59 is provided. with a recess 60 and ball 61,engaging the bushing 51 and preventing backward rotation of the shaft13.

Variations may be resorted to within the scope of my invention andportions of my improvements may be used without others.

Having thus described my invention, I claim 1. In a ribbon-reversingmechanism, the combination with a pair of ribbon-spool shafts, of atransverse driving-shaft, two

pairs of cooperating cams upon said drivingshaft, one cam in each paircom'iectedto the shaft to rotate therewith and the other cam in eachpair loose upon the shaft, and means controllable by the ribbon forlocking the loose cams against rotation so that they co operate with therotating cams to shift the shaft endwise.

2. In a ribbon-reversing mechanism, the combination with a pair ofribbon-spool shafts having gears, of a driving-shaft having gearstoanesh with said gears in alternation, two pairs of shaft-shifting camsupon said driving-sh aft, one cam in each pair connected to the shaft torotate therewith, and the other cam in each pair loose upon the shaft,means for locking said loose cams alternately against rotation, andmeans releasable through the ribbon movements for holding said lockingmeans in idle position.

3. In a ribbon-reversing mechanism, the combination wit a pair "ofribbon -spool shafts,.of a driving-shaft, two pairs of shaftshiftingdevices, each pair consisting of a cam" and a wheel having a circularseries of cams,

one device in each pair connected to thedriving-shaft-to rotatetherewith, and the other device in each pair being normally idle, andribbon-controlled mean s for locking one in ember of each pair so thatit may cooperate with its companion to shift said driving-shaft.

4. In a ribbon-reversing mechanism, the combination of a pair of ribbonspool shafts, a drivingshaft, two pairsv of normally ineffective camdevices 11 )on said driving-shaft, and means controllable by the ribbonmove ments for causingthe devices in one pair ill? ternately with thedevices in the other pair to cooperate to reciprocate. saiddriving-shaft.

5. In a ribbon-reversing mechanism, the combination with a pair ofribbon-spools, and a common driver, of two pairs of normally inefiectiverotatable cam devices, and means controllable by the longitudinalmovements of the ribbon for rendering said pairs of cam devicesalternately effective to cause shifting moven'ients between said spoolsand said driver.

6. In a ribbon-reversing mechanism, the combination with a pair ofspool-shafts and a driving-shaft, of two wheels fixed upon saiddriving-shaft and each carrying a circular series of-cams, a loosetoothed wheel associated with each of said cam-wheels, said toothedwheels having cams toeooperate with. said cam-wheels, pawls for holdingsaid toothed wheels stationary, and means releasable by the ribbon forholding said pawls in effective position.

7. In a ribbon-reversing mechanism, the combination with a pair ofspool-shafts and a driving-shaft, of two wheels fixed upon said wheelsstationary, springs which hold said pawls out of effective position, andparts extending into the path of the ribbon so as to be moved thereby,for releasing said pawls.

8. In a ribbon-reversing mechanism, the combination with a pair ofspool-shafts and a driving-shaft, of two Wheels fixed upon saiddriving-shaft and each carrying a circular series of cams, a loosetoothed wheel associated with each of said cam-wheels, said toothedwheel having cams to cooperate with said cam-wheels, pawls for holdingsaid. toothed wheels stationary, rock-shafts'having arms extending intothe path of the ribbon so as to be moved thereby, springs holding saidrockshafts in normal position, and arms upon said rock-shafts holdingsaid 'pawls away from said tooth ed wheels. i

9. In a ribbon-reversing mechanism, the

- combination with a pair of spool-shafts and a driving-shaft shiftableendwise to connect with said spool-shafts, of toothed wheels loose uponsaid driving-shaft, means preventing said toothed wheels from shiftingaxially with said driving-shaft, cams upon said toothed wheels,cam-wheels fixed upon said driving-shaft to cooperate with the cams uponsaid toothed wheels, pa'wls for holding said toothed wheels stationary,springs hold-' ing said pawls out of effective position, andribbon-controlled means for releaslng said pawlsin alternation.

10. In a ribbon-reversing. mechanism, the combination with a pair ofspool-shafts, of a ."driving-shaft shiftable endwise to connect withsaid'spool-shafts, toothed wheels loose upon said driving-shaft, camsprojecting lat- 'erally from said toothed wheels, means preventing saidtoothed wheels from shifting axially with saidshaft, wheels fixed upon.

said driving-shaft and each provided with a series of cams rojectinglaterally toward said toothed w eels, normally ineffective means forholdin said toothed wheels against rotation, and ri bon-con'trolleddevices for causing said holding means to engage said toothed wheels.

' 11. In a ribbon-reversing mechanism, the combination'with a ribbon-spool having a car, of a driving-shaft having a gear, means eingprovided for unwinding the: ribbon from said spool while said gears areout of mesh,- cooperating cams upon said drivingshaft, one cam connectedto the shaft to rotate therewith and the other cam loose upon the shaft,and means controllable bythe said loose member having a series of teeth,a pawl, a spring-controlled member for holding saidpawl normally out ofengagement with said teeth, and means for enabling the move ment' of theribbon to release said pawl so that it ma engage said teeth to lock saidher in position to cooperate with said shifter,

loose mem er against rotation, so that the latter may cooperate withsaid shifter to 13. The combination with a pair of spoolshafts and adriving-shaft-movable e'ndwise' to connect with either spool-shaft, of abush ing or collar upon saiddriving-shaft, a stud projecting from saidbushin a crank loosely engaging said stud and fixe upon said shaft,means'for preventing said bushing from movingin. axial direction, and acrank mounted loosel upon said bushing and having a ball or-roler-clutch connection therewith.

14. The combination with a pair of spoolshaftsand a driving-shaftmovable.'endwise to'connectwith either spool-shaft, of a bush-' .ingorcollar upon said driving-shaft, a stud projecting fromsaid bushin acrank loosely engaging said stud and fixe upon said shaft means forpreventing said bushing from moving in axial direction, and a crankmounted looselyupon said bushing and having a ball or roller-clutchconnection therewith, and a fixed member. also having a ball orrollerclutch connection with said bushing for preventing backwardrotation of the driving-, shaft FRANK A. oo'oK;

Witnesses:

- Enw: J i MANNING,

Enw; PFSToRY.

s effect shifting movement between said spool and said driver.

